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Finding the Fourth Proportional to 147.91, 221.54 and 121.94

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Solution

The fourth proportional to 147.91, 221.54 and 121.94 is: 182.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.91 : 221.54 = 121.94 : x
  2. Step 2: Convert to fraction form
    147.91/221.54 = 121.94/x
  3. Step 3: Cross multiply
    147.91x = 221.54 × 121.94
  4. Step 4: Simplify right side
    147.91x = 27,013.01
  5. Step 5: Solve for x
    x = 27,013.01/147.91
  6. Step 6: Final answer
    x = 182.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.